05000313/FIN-2012005-07
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Finding | |
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| Title | Failure to Correct a Degraded Condition Associated with the Unit 2Condenser Vacuum Pump Solenoid Valves Results in Reactor Trip |
| Description | The inspectors documented a self-revealing finding for the failure to identify the cause and take appropriate corrective actions to address the degraded performance of the Unit 2 condenser vacuum pump solenoid valves. Specifically, from 2008 through 2012, Unit 2 operations staff identified the degraded performance of several solenoid valves associated with the condenser vacuum pumps. These performance issues were entered into the corrective action program a number of times during this period. On August 8, 2012, while switching condenser vacuum pumps for oil checks, two solenoid valves failed to close resulting in a turbine trip and an automatic trip of the reactor. The licensee has entered this issue into the corrective action program as Condition Report CR-ANO-2-2012-1429. The failure to identify the cause and take appropriate corrective actions to address the degraded performance of the Unit 2 condenser vacuum pump solenoid valves is determined to be a performance deficiency. The performance deficiency is determined to be more than minor because it is associated with the equipment performance attribute of the Initiating Events Cornerstone and adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenged critical safety functions during power operations, and is therefore a finding. Using Manual Chapter 0609, Attachment 4, Initial Characterizations of Findings, and Appendix A, The Significance Determination Process (SDP) for Findings at Power, the finding was determined to have very low safety significance (Green) because, although it resulted in a reactor trip, it did not result in the loss of mitigating equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The finding does not have a cross-cutting aspect because none were determined to be appropriate. |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2012005 Section 4OA3 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Fairbanks A Sanchez C Osterholtz D Allen J Drake N Hernandez R Latta S Hedger T Buchanan T Farina W Schaup |
| INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000313/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2012Q4
Self-Identified List (Arkansas Nuclear)
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